| 摘要 |
<p>A bundle of small rectilinear pipes (2a, 2b, 2c...) connected in series wherein a secondary fluid circulates, arranged in a fin tube (1) wherein a primary fluid circulates, has undulations inclined in opposite direction onto both sections of adjacent pipes (2a, 2b), (2b, 2c)..., which avoid the overlapping between the spirals of two adjacent pipes. Application to gas mixed boilers. </p> |
